var levels = [
    [
        [0, 0,],
    ],
    [
        [0, 0,],
        [50, 50,],
    ],
    [
        [0, 0,],
        [100, 50, 2],
        [300, 50, 100],
    ],
    [
        [0, 0,],
        [100, 50,],
        [200, 50,],
        [200, 60,],
    ],
    [
        [0, 0,],
        [100, 50,],
        [200, 50,],
        [200, 50,],
    ],
    [
        [0, 0,],
        [100, 50,],
        [200, 50,],
    ],
]

